1-12, p. 50

1. A physical property is property that can be observed and measured without changing the chemical makeup of the substance.
2. Three physical properties of water are it's freezing point (O degrees celsius), it's boiling point (100 degrees celsius), and it's density (1.00 g/mL at 25 degrees Celsius).
3. The density of ice is less than the density of water.
4. An example of a setting like this could be in one of the hot springs in Yellowstone National Park during the winter time. The hot springs are surrounded by ice and snow. The surrounding ice/snow might melt and becomes part of the hot spring. After it turns into a liquid state, the water molecules are moving fast enough from the intense heat, that they have reached a point that they are able to evaporate and become water vapor.

5. Heterogeneous and homogeneous mixtures are different because heterogeneous mixtures can still be separated physically and are made up of varying amounts of atoms, while homogenous mixtures are even throughout and have an equal amount of atoms. Heterogeneous mixtures also usually contain particles that settle at the bottom.
6. You need to know the density of both of the liquids to determine which one will be on top.
7.
a. a medicine accompanied by instructions to "shake before using": suspension
b. Italian salad dressing: suspension
c. mayonnaise: colloid
d. a cola soft drink: solution
e. an oil-based paint: suspension
f. milk: colloid
8. It demonstrates that the air in the room is a colloid because the beam of light bounces off of the particles in the air. In a solution, the particles are dissolved into the atoms and will not reflect the light. In a suspension, the particles are too large and cloudy and block the Tyndall effect from occurring.
9. see sketch on paper
10. It must be a colloid for the reasons presented. It can not be a suspension because particles would have settled at the bottom, and it can not be a solution because the beam of light would not have shone in the middle because in a solution, the particles are absorbed.
11. Substance is a material with a definite, uniform composition with distinct properties. Two examples are  elements and compounds.
12.
a. CO: compound
b. Co: element
d. HCI: compound
d. Mg: element
e. NaHCO3: compound
f. NO: compound
g. I2: element